EP1491762B1 - Layout structure of a fuel injection device in a motorcycle - Google Patents

Layout structure of a fuel injection device in a motorcycle Download PDF

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Publication number
EP1491762B1
EP1491762B1 EP04012332A EP04012332A EP1491762B1 EP 1491762 B1 EP1491762 B1 EP 1491762B1 EP 04012332 A EP04012332 A EP 04012332A EP 04012332 A EP04012332 A EP 04012332A EP 1491762 B1 EP1491762 B1 EP 1491762B1
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EP
European Patent Office
Prior art keywords
cylinder head
fuel injection
valve
arranged
intake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP04012332A
Other languages
German (de)
French (fr)
Other versions
EP1491762A3 (en
EP1491762A2 (en
Inventor
Masaya Kurokawa
Tomoharu Kawano
Eiichi Ishikawa
Toshinao Takigawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2003177574A priority Critical patent/JP4270954B2/en
Priority to JP2003177574 priority
Priority to JP2004061640 priority
Priority to JP2004061640A priority patent/JP4620367B2/en
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP1491762A2 publication Critical patent/EP1491762A2/en
Publication of EP1491762A3 publication Critical patent/EP1491762A3/en
Application granted granted Critical
Publication of EP1491762B1 publication Critical patent/EP1491762B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62MRIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00Motorcycles characterised by position of motor or engine
    • B62M7/02Motorcycles characterised by position of motor or engine with engine between front and rear wheels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02Valve drive
    • F01L1/022Chain drive
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/18Rocking arms or levers
    • F01L1/181Centre pivot rocking arms
    • F01L1/182Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10Air intakes; Induction systems
    • F02M35/10209Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10Air intakes; Induction systems
    • F02M35/10242Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10255Arrangements of valves; Multi-way valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/162Motorcycles; All-terrain vehicles, e.g. quads, snowmobiles; Small vehicles, e.g. forklifts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04Injectors peculiar thereto
    • F02M69/042Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04Injectors peculiar thereto
    • F02M69/042Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/044Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00Valve arrangements comprising rollers
    • F01L2305/02Mounting of rollers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20SOHC [Single overhead camshaft]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00Cylinders; Cylinder heads
    • F02F1/24Cylinder heads
    • F02F1/242Arrangement of spark plugs or injectors

Description

    BACKGROUND OF THE INVENTION Field of the Invention
  • The present invention relates to an improvement of a fuel injection type engine according to the preamble of claim 1 which includes a cylinder head in which an intake port is formed. A throttle body has an intake passage leading to the intake port in a body thereof and a throttle valve is arranged which is capable of controlling a flow area of the intake passage in the body such that the throttle valve is operable to be opened and closed. A fuel injection valve injects fuel toward the intake port.
  • Description of Background Art
  • A fuel injection type engine according to the preamble of claim 1 is known from US-B1-6 196 186 .
  • In general, with respect to a vehicle-use engine, there has been proposed a vehicle-use engine which adopts a fuel injection device in place of a carburetor as the fuel supply means from a viewpoint of the enhancement of the accuracy of controlling the fuel, the purification of an exhaust gas, the low fuel consumption or the like. When such a fuel injection type engine is mounted on a motorcycle and the fuel injection device is mounted on a cylinder of the engine, a total height of the engine is increased. Hence, there arises a drawback in that a total height of the motorcycle is increased.
  • To solve such a drawback, for example, there has been proposed a technique wherein a cylinder of an engine mounted on a motorcycle is inclined toward a vehicle front side and a valve shaft of a fuel injection device is arranged substantially parallel to a cylinder shaft. See, Japanese Patent Publication JP 2995198 B .
  • Here, when the motorcycle is an offroad vehicle, the motorcycle is required to satisfy a more speedy operation to cope with the manipulation demands of a rider. Hence, it is desirable to miniaturize the vehicle as a whole. Thus, the application of the layout structure of the fuel injection device described in Japanese Patent Publication JP 2995198 B to such an offroad vehicle is considered.
  • In addition, there has been disclosed a fuel injection type engine which mounts a fuel injection valve for injecting fuel toward an intake port of a cylinder head on the cylinder head. See, for example, Japanese Unexamined Patent Publication JP 11-245894 A .
  • However, in the conventional construction, a valve shaft is provided substantially parallel to the cylinder of the engine. Hence, a large space is formed between a main frame which constitutes a vehicle body frame and the engine. In addition, at the same time, a large space is formed between the fuel injection device and the main frame.
  • Accordingly, even when such a construction is applied to the offroad vehicle, it is difficult to achieve the further enhancement of the layout efficiency thus giving rise to drawbacks including a drawback that the achievement of the miniaturization of the vehicle is difficult.
  • SUMMARY AND OBJECT OF THE INVENTION
  • Here, with respect to the conventional fuel injection type engine, a throttle body is connected to an intake port of the cylinder head by way of an intake manifold and the intake manifold is formed in a state that the intake manifold is curved or bent in the upward direction in the vicinity of a connecting portion with the intake port. To prevent the interference of the fuel injection valve with the intake manifold, the fuel injection valve is mounted on the cylinder head such that most of the fuel injection valve is embedded in the cylinder head. Accordingly, heat is easily transferred from a fuel combustion chamber to the fuel injection valve. Thus, it is necessary to take heat resistance countermeasures of the fuel injection valve whereby the throttle body has to be arranged at a position relatively remote from the cylinder head thus making the miniaturization of the whole engine also including the throttle body difficult.
  • The present invention is made in view of such circumstances and it is an object of the present invention to provide a fuel injection type engine having a compact arrangement, in which a fuel injection valve can be effectively cooled.
  • This object is achieved by a fuel injection type engine having a structure according to claim 1.
  • The present invention is directed to a fuel injection type engine which includes a cylinder head in which an intake port is formed with a throttle body which has an intake passage leading to the intake port in a body thereof. The throttle valve is arranged to be capable of controlling a flow area of the intake passage in the body such that the throttle valve is operable to be opened and closed. A fuel injection valve injects fuel toward the intake port, wherein a connecting sleeve portion which projects more outwardly than a joint portion of the cylinder head and a head cover and forms an inlet portion of the intake port is integrally formed with the cylinder head such that an axis of the input portion is arranged on a plane which is substantially orthogonal to a cylinder axis. A mounting hole allows a distal end portion of the fuel injection valve mounted on the cylinder head to inject fuel towards the intake port to be hermetically fitted therein which is formed in the connecting sleeve portion. The throttle body is connected to the connecting sleeve portion by way of an insulator such that an axis of the intake passage is arranged on the plane.
  • According to the constitution of the present invention, it is possible to expose most of the throttle body except for the distal end portion of the fuel injection valve while arranging the throttle body close to the cylinder head. Thus, the whole engine including the throttle body can be miniaturized whereby the effective cooling of the fuel injection valve can be realized.
  • Preferably, the present invention includes an insulator that is formed such that the insulator is bent towards the inside of the plane, and a throttle drum which is arranged outwardly from the body and is integrally rotated with the throttle valve is arranged at a side opposite to the cylinder head. Due to such a constitution, since the insulator is bent, it is possible to arrange the throttle body close to the cylinder head side and, at the same time, there is no possibility that the fuel injection valve obstructs the arrangement of a throttle wire which is wound around the throttle drum.
  • Preferably, the present invention provides an intake valve and an exhaust valve which are operable to be opened and closed and are arranged in the cylinder head such that operational axes thereof intersect in an approximate V-shape on a projection view to a plane which includes the cylinder axis and an axis of an inlet portion of the intake port, and a valve actuating device which has an axis substantially parallel to an axis of the inlet portion of the intake port. Preferably, a camshaft is provided which is arranged between the intake valve and the exhaust valve and is housed in a valve actuating chamber which is formed between the cylinder head and the head cover jointed to the cylinder head. Due to such a constitution, it is possible to decrease a width of an upper portion of the cylinder head as much as possible. Thus, a projecting portion of the fuel injection valve from the cylinder head can be increased whereby it is possible to cool the fuel injection valve more effectively.
  • Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the scope of the invention will become apparent to those skilled in the art from this detailed description.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
    • Fig. 1 is a side view of a small motorcycle according to the present invention;
    • Fig. 2 is a view as viewed from the direction of an arrow 2 in Fig. 1 by omitting a fuel tank and a rider seat;
    • Fig. 3 is a side view of a lower portion of an engine;
    • Fig. 4 is a longitudinal cross-sectional side view of an upper portion of the engine;
    • Fig. 5 is a plan view with a part broken away as viewed from the direction of an arrow 6 in Fig. 4 in a state that a head cover is omitted;
    • Fig. 6 is a cross-sectional view taken along a line 7-7 in Fig. 5; and
    • Fig. 7 is a bottom view of an essential part of a cylinder head along a line 8-8 in Fig. 6.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • One embodiment of the present invention is explained in conjunction with attached drawings hereinafter.
  • Figs. 1-7 show an embodiment of the present invention. As illustrated in Figs. 1 and 2, a vehicle body frame 211 of a small motorcycle which is used in a trial competition includes a head pipe 212, a pair of left and right main frames 213, 213 which extend rearwardly and downwardly from the head pipe 212, a pair of down tubes 214 ... which respectively extend downwardly from front portions of the main frames 213 ..., a pair of center frames 215 which extend downwardly in a contiguously integrated manner with rear ends of both main frames 213 ..., an intermediate portion cross member 216 which connects intermediate portions of both main frames 213 ..., a rear portion cross member 217 which connects rear portions of both main frames 213 ..., and a lower portion cross member 218 which connects lower portions of both center frames 215 ....
  • A front fork 219 which supports a front wheel WF in a steerable manner is supported on a head pipe 212 formed on a front end of the vehicle body frame 211 and a bar-like steering handle 220 is connected to the front fork 219. Further, a front end portion of the rear fork 221 which pivotally supports a rear wheel WR at a rear end portion thereof is vertically tiltably mounted on the pair of left and right center frames 215 ... by way of a pivot shaft 222. Further, a link mechanism 223 is provided between the lower cross member 218 and the rear fork 221 and a rear cushion 224 is provided between the link mechanism 223 and the rear cross member 217.
  • A fuel tank 225 is mounted between front portions of the pair of left and right main frames 213 ..., a rider's seat 226 which is arranged behind the fuel tank 225 is supported on the intermediate cross member 216 and the rear cross member 217 and a rear fender 227 is contiguously formed on a rear end of the rider seat 226.
  • Between the front wheel WF and the rear wheel WR, a power unit P is arranged which includes a water-cooled, fuel-injection-type and single-cylinder 4-cycle engine E and a constant-mesh transmission M. An engine body 230 of the engine E is supported on lower end portions of the pair of left and right down tubes 214 ... with a hanger plate 228 extending downwardly from the intermediate portions of the main frames 213 ... and the lower cross member 218. Below the engine body 230, a skid plate 229 is arranged in a state wherein a gap is defined between the skid plate 229 and a lower portion of the engine body 230. The skid plate 229 is mounted on a lower end portion of the down tube 214 ... and the lower cross member 218.
  • In Figs. 3 and 4, the engine body 230 of the engine E includes a crankcase 231 ..., a cylinder block 232 which is coupled to the crankcase 231 ..., a cylinder head 233 which is coupled to the cylinder block 232 and a head cover 234 which is coupled to the cylinder head 233.
  • The crankcase 231 ... rotatably supporting a crankshaft 236 is formed by coupling a right case half (not shown in the drawing) which is arranged at the right side at the time of mounting the crankcase 231 ... on the motorcycle and a left case half 238 which is arranged at the left side at the time of mounting the crankcase 231 ... on the motorcycle at a mating surface which is arranged along a plane orthogonal to an axis of the crankshaft 236. Further, in the inside of the crankcase 231 ..., a crank chamber housing a main portion of the crankshaft 236 and a transmission chamber housing the transmission M are formed in a state wherein these chambers are partitioned from each other by a partition wall.
  • In the inside of the crank chamber, a main portion of the crankshaft 236 is housed. A large end portion of a connecting rod 245 contiguously formed with a piston 244 which is slidably fitted into a cylinder bore 243 formed in the cylinder block 232 is connected to the crankshaft 236 by means of a crankpin.
  • The above-mentioned transmission M includes a main shaft 252 which has an axis parallel to the crankshaft 236 and is rotatably supported on the right and left case halves by way of ball bearings and a counter shaft 253 which has an axis parallel to the main shaft 252 and is rotatably supported on the right and left case halves by way of ball bearings. A group of drive gears having a plurality of speed change stages are mounted on the main shaft 252. A group of driven gears which correspond to the group of drive gears are mounted on the counter shaft 253. Here, among the group of drive gears and the group of driven gears, due to the selective establishment of gears which correspond to each other, an output of the engine E is subjected to a speed change in a plurality of stages and is, thereafter, transmitted to the counter shaft 253.
  • Returning back to Fig. 1, on an end portion of the counter shaft 253 which projects from the left case half 238 than the pivot shaft 222 at a front side, a drive sprocket wheel 257 is fixedly mounted, and an endless chain 259 is wound around a driven sprocket wheel 258 which is fixedly mounted on the rear wheel WR and the drive sprocket wheel 257.
  • A water return pipe is mounted on a pump cover in a pump housing of a water pump 280 (see Fig. 3), while a hose 285, see Fig. 1, which is arranged in front of the engine body 230 and guides water from a radiator 286 supported on both down tubes 214 ... of the vehicle body frame 211 is connected to the water return tube. Further, water discharged from the water pump 280 is supplied to a cooling jacket 287 (see Fig. 4) which is in communication with the water pump 280 mutually and is formed on the cylinder block 232 and the cylinder head 233 by way of the crankcase 231.
  • To explain further in conjunction with Figs. 5 and 6, between the cylinder block 232 and the cylinder head 233, a combustion chamber 2117 is formed with a top portion of the piston 244. Further, in the cylinder head 233, with respect to a projection view to a first plane PL1, a plane parallel to Fig. 4, which includes an axis of the cylinder bore 243, that is, the cylinder axis C, a plurality of (a pair of in this case) intake valves 2118 ... and exhaust valves 2119 ... for respective sides are arranged such that their operational axes cross in an approximately V-shape and they can be operated to be opened and closed.
  • In the cylinder head 233, a pair of intake valve openings 2120 ... face the combustion chamber 2117 such that the intake valve openings 2120 ..., respectively, are opened or closed by the respective intake valves 2118 .... A single intake port 2121 is provided which is in communication with both intake valve openings 2120 ... in common. The single intake port 2121 opens at a rear side wall of the cylinder head 233. A pair of exhaust valve openings 2122 ... are provided which face the combustion chamber 2117 such that the exhaust valve openings 2122 are respectively opened or closed by the respective exhaust valves 2119 .... A single discharge port 2121 is provided which is in communication with both exhaust valve openings 2120 ... in common. The single discharge port 2121 opens at a front side wall of the cylinder head 233.
  • Further, the cylinder head 233 is provided with a pair of intake-side guide sleeves 2124 ... which allow both intake valves 2118 ... to be slidably fitted therein so as to guide the opening-closing operation of both intake valves 2118 ... and a pair of exhaust-side guide sleeves 2125 ... which allow both exhaust valves 2119 ... to be slidably fitted therein so as to guide the opening-closing operation of both exhaust valves 2119 .... Between the upper end portions of both intake valves 2118 ... which project from the intake-side guide sleeves 2124 and the cylinder head 233, valve springs 2126 ... are interposed which bias the respective intake valves 2118 ... in the valve closing direction. In addition, between the upper end portions of both exhaust valves 2119 ... which project from the exhaust-side guide sleeves 2125 and the cylinder head 233, valve springs 2127 ... are interposed which bias the respective exhaust valves 2119 ... in the valve closing direction.
  • With the rear side wall of the cylinder head 233, a connecting sleeve portion 2138 which projects outwardly relative to a coupled portion between the cylinder head 233 and the head cover 234 and forms an inlet portion 2121a of the intake port 2121 is integrally formed in a state wherein an axis of the inlet portion 2121a is arranged in a second plane PL2 which is substantially orthogonal to the cylinder axis C.
  • A throttle body 2129 is connected to the connecting sleeve portion 2138 by way of an insulator 2128. Here, the insulator 2128 is formed by adhering a flange 2128b to a downstream end of a sleeve portion 2128a made of rubber by baking, wherein the flange 2128b is bonded to the connecting sleeve portion 2138. The throttle body 2129 which is connected to an upstream end portion of the insulator 2128 is configured such that in a body 2131 having an intake passage 2130 leading to the intake port 2121, a throttle valve 2132 which is capable of controlling a flow area of the intake passage 2130 is arranged in a state wherein the throttle valve 2132 can be opened and closed.
  • Further, the sleeve portion 2128a of the insulator 2128 is formed to be bent in the above-mentioned second plane PL2, while the throttle body 2129 is connected to an upstream end portion of the insulator 2128 such that the intake passage 2130 is arranged on the second plane PL2. Further, the throttle body 2129 is arranged outside of the body 2131 such that the throttle body 2129 is integrally rotatable with the throttle valve 2132 and, at the same time, the throttle body 2129 is provided with a throttle drum 2133 around which a throttle wire 2134 is wound and to which the throttle wire 2134 is connected. In a posture wherein the throttle drum 2133 is arranged at a side opposite to the cylinder head 233, the throttle body 2129 is connected to the cylinder head 233 by way of the insulator 2128.
  • Here, a fuel injection valve 2135 which injects fuel toward the intake port 2121 is mounted on the cylinder head 233. In the connecting sleeve portion 2138 of the cylinder head 233, a mounting hole 2136 which allows the hermetic fitting of a distal end portion of the fuel injection valve 2135 therein is formed, while a rear end portion of the fuel injection valve 2135 which allows the distal end portion to be hermetically fitted in the mounting hole 2136 is fitted in a holder 2137 which is fastened to the cylinder head 233. That is, the fuel injection valve 2135 is mounted on the cylinder head 233 such that the fuel injection valve 2135 is sandwiched between the cylinder head 233 and the holder 2137. Fuel is supplied from the holder 2137 to the fuel injection valve 2135.
  • Here, a valve actuating device 2140 for performing an opening-closing drive for each pair of intake valves 2118 ... and the exhaust valves 2119... includes a cam shaft 2141 which is arranged between both intake valves 2118 ... and both exhaust valves 2119 ... while having an axis thereof which is substantially parallel to the axis of the inlet portion 2121a of the intake port 2121, an intake-side rocker arm 2142 which is tilted in response to the rotation of the cam shaft 2141 and performs the opening-closing drive of both intake valves 2118 ... and an exhaust-side rocker arm 2143 which is tilted in response to the rotation of the cam shaft 2141 and performs the opening-closing drive of both exhaust valves 2119 .... The valve actuating device 2140 is housed in a valve actuating chamber 2144 formed between the cylinder head 233 and the head cover 234 which is connected to the cylinder head 233.
  • Both end portions of the cam shaft 2141 are rotatably supported between the coupled surfaces of the cylinder head 233 and the head cover 234 by way of ball bearings 2145, 2146 and a rotational force of the crankshaft 236 is transmitted to one end portion of the cam shaft 2141 by way of a timing transmission device 2147.
  • The timing transmission device 2147 includes a drive sprocket wheel which is integrally formed with a portion of the crankshaft 236 which projects from the left case half 238 of the crankcase 231 ..., a driven sprocket wheel 2149 which is fixed to one end portion of the cam shaft 2141 and a cam chain 2150 which is wound around the drive sprocket wheel and the driven sprocket wheel 2149. A chain chamber 2151 which houses the traveling cam chain 2150 is formed in a passage ranging from the crankcase 231 to the cylinder head 233 by way of the cylinder block 232.
  • At both sides of the cam shaft 2141, an intake-side rocker shaft 2152 and an exhaust-side rocker shaft 2153 are arranged while having respective axes thereof parallel to the camshaft 2141. Both end portions of the rocker shafts 2152, 2153 are fixedly supported in a state that both end portions are sandwiched between the cylinder head 233 and the head cover 234.
  • The intake-side rocker arm 2142 is tiltably supported on the intake-side rocker shaft 2152 and is integrally provided with an arm 2142a which pivotally supports a roller 2156 which comes into rolling contact with an intake-side cam 2154 formed on the cam shaft 2141 and arms 2142b, 2142c which bring distal end portions thereof into contact with upper end portions of both intake valves 2118 .... Further, the exhaust-side rocker arm 2143 is tiltably supported on the exhaust-side rocker shaft 2153 and is integrally provided with an arm 2143a which pivotally supports a roller 157 which comes into rolling contact with an exhaust-side cam 2155 formed on the cam shaft 2141 and arms 2143b, 2143c which bring distal end portions thereof into contact with upper end portions of both exhaust valves 2119 ....
  • The cam shaft 2141 is arranged at an offset position at the chain chamber 2151 side such that another end portion thereof, that is, a portion thereof which is supported on the cylinder head 233 and the head cover 234 by way of the ball bearing 2146 is made to substantially correspond to the center portion of the combustion chamber 2117. Further, a peripheral wall of the valve actuating chamber 2144 is formed of valve actuating chamber forming walls 233a, 234a which are formed on the cylinder head 233 and the head cover 234. A recessed portion 2158 is formed out of the valve actuating chamber forming walls 233a, 234a, in a portion thereof which corresponds to another end portion of the cam shaft 2141.
  • On the other hand, an ignition plug 2159 which has a distal end thereof facing the approximately center portion of the combustion chamber 2117 and a rear end portion thereof arranged in the recessed portion 2158 is mounted on the cylinder head 233 in an inclined manner such that a rear end side thereof is shifted away from the chain chamber 2151. A plug mounting hole 2160 is formed in the cylinder head 233 for mounting the ignition plug 2159.
  • Here, the cylinder head 233 is provided with a cooling water lead-out pipe portion 2161 for leading out cooling water from the cooling jacket 287 and the cooling water lead-out pipe portion 2161 and the radiator 286 are connected to each other by way of a hose 2162, see Fig. 1.
  • Further, the cooling water lead-out pipe portion 2161 is connected to the cylinder head 233 such that the cooling water lead-out pipe portion 2161 is arranged at a side opposite to the chain chamber 2151 and outside the valve actuating chamber forming walls 233a, 234a and, at the same time, extends substantially parallel to the cylinder axis C at a position offset to either one side of the intake valve 2118 ... and the exhaust valve 2119 ..., in this embodiment, at a position offset to the exhaust valve 2119 side from the recessed portion 2158.
  • Further, an angle α1 which the operation axis of the exhaust valve 2119 ... which is disposed closer to the cooling water lead-out pipe portion 2161 out of the intake valve 2118 ... and the exhaust valve 2119 ... makes with respect to the cylinder axis C on a projection view to the first plane PL1 is set smaller than an angle α2 which an operation axis of the intake valve 2118 ... which constitutes another valve makes with respect to the cylinder axis C on the projection view.
  • Further, as shown in Fig. 7 an opening portion of plug mounting hole 2160 leading to the combustion chamber 2117 is arranged offset to the intake valve 2118 ... side from the cylinder axis C. A distance between the opening portion of plug mounting hole 2160 leading to the combustion chamber 2117 and the intake valve openings 2120 ... which face the combustion chamber 2117 and are formed in the cylinder head 233 is set smaller than a distance between the exhaust valve openings 2122 ... which face the combustion chamber 2117 and are formed in the cylinder head 233 and the opening portion of the plug mounting hole 2160.
  • Further, the axis of the cam shaft 2141 in the valve actuating device 2140 is arranged offset to a side opposite to the cooling water lead-out pipe portion 2161 than the third plane PL3 which is parallel to the cam shaft 2141 and includes the cylinder axis C.
  • Here, the throttle body 229 is connected with an air cleaner 2165 which is arranged behind the throttle body 2129 and is supported on the vehicle body frame 211. As described above, the cylinder head 233 of the engine E which is formed in a SOHC type, the fuel injection valve 2135 and the throttle body 2129 are arranged between a pair of left and right main frames 213, 213 provided to the vehicle body frame 211.
  • Further, an exhaust pipe 2166 which has an upstream end thereof connected with the exhaust port 2123 of the cylinder head 233 extends rearwardly at the right side of the engine body 230, while the exhaust pipe 2166 has a downstream end thereof connected to an exhaust muffler 2167 arranged at the right side and above the rear wheel WR.
  • The connecting sleeve portion 2138 which projects outwardly relative to the coupled portion between the cylinder head 233 and the head cover 234 and forms the inlet portion 2121a of the intake port 2121 is integrally formed in the cylinder head 233 in a state wherein the axis of the inlet portion 2121 a is arranged in the second plane PL2 which is substantially orthogonal to the cylinder axis C. The mounting hole 2136 which allows the hermetic fitting of the distal end portion of the fuel injection valve 2135 which is mounted on the cylinder head 33 such that the fuel is injected toward the intake port 2121 therein is formed in the connecting sleeve portion 2138. Further, the throttle body 2129 is connected to the connecting sleeve portion 2138 by way of the insulator 2128 in a state wherein the axis of the intake passage 2130 is arranged on the second plane PL2.
  • According to such a mounting structure of the fuel injection valve 2135, it is possible to expose most of the portion of the throttle body 2129 except for the distal end portion of the fuel injection valve 2135 to the outside of the cylinder head 233 while arranging the throttle body 2129 close to the cylinder head 233. Thus, the whole engine E including the throttle body 2129 can be miniaturized whereby the effective cooling of the fuel injection valve 2135 can be realized.
  • Further, the insulator 2128 is formed such that the insulator 2128 is bent in the inside of the second plane PL2, and the throttle drum 2133 which is provided to the throttle valve 2129 is arranged at a side opposite to the cylinder head 233. Due to such a construction, it is possible to arrange the throttle body 2129 close to the cylinder head 233 side and, at the same time, there is no possibility that the fuel injection valve 2135 obstructs the arrangement of a throttle wire 2134 which is wound around the throttle drum 2133.
  • The engine E is formed as an SOHC type such that the intake valve 2118 ... and the exhaust valve 2119 ... which are operable to be opened and closed are arranged in the cylinder head 233 such that operational axes thereof intersect in an approximately V-shape on the projection view to the first plane PL1 which includes the cylinder axis C and the axis of the inlet portion 2121 a of the intake port 2121, and the cam shaft 2141 having the axis which is substantially parallel to the axis of the inlet portion 2121a of the intake port 2121 is arranged between the intake valves 2118 ... and the exhaust valves 2119 .... Due to such a construction, it is possible to decrease the width of the upper portion of the cylinder head 233 as much as possible. Thus, the projecting portion of the fuel injection valve 2135 from the cylinder head 233 can be increased whereby it is possible to cool the fuel injection valve 2135 more effectively.
  • Further, the cylinder head 233 of the engine E having the single cylinder, the fuel injection valve 2135 and the throttle body 2129 are arranged between a pair of left and right main frames 213, 213 of the vehicle body frame 211. Due to such a construction, it is possible to arrange the fuel injection valve 2135 and the throttle body 2129 while narrowing the distance between the pair of left and right main frames 213, 213 and this contributes to the enhancement of the saddling property and riding comfortableness of a rider.
  • Although the embodiments of the present invention have been explained heretofore, the present invention is not limited to the above-mentioned embodiments and various design changes can be made without departing from the present invention described in claims.
  • As described above, according to the present invention, it is possible to expose most of the portion of the throttle body except for the distal end portion of the fuel injection valve while arranging the throttle body close to the cylinder head. Thus, the whole engine including the throttle body can be miniaturized whereby the effective cooling of the fuel injection valve can be realized.
  • Further, according to the present invention, the insulator is bent. Thus, it is possible to arrange the throttle body close to the cylinder head side and, at the same time, there is no possibility that the fuel injection valve obstructs the arrangement of a throttle wire which is wound around the throttle drum.
  • Further, according to the present invention, it is possible to decrease the width of the upper portion of the cylinder head as much as possible. Thus, the projecting portion of the fuel injection valve from the cylinder head can be increased whereby it is possible to cool the fuel injection valve more effectively.
  • Further, according to the present invention, it is possible to arrange the fuel injection valve and the throttle body while narrowing the distance between the pair of left and right main frames provided to the small motorcycle and this contributes to the enhancement of saddling property and riding comfortableness of a rider.
  • In a motorcycle, the vehicle body frame includes main frames which are inclined rearwardly and downwardly directly towards a rear portion of a vehicle body from a head pipe with the engine being arranged close to an inclined portion of the vehicle body frame and the fuel injection device is overlapped to the main frames. In a fuel injection type engine including a cylinder head, a throttle body has an intake passage leading to an intake port and a fuel injection valve which injects fuel towards the intake port, the throttle body can be arranged close to a cylinder head and, at the same time, the fuel injection valve can be cooled effectively. A connecting sleeve portion projects further outwardly relative to a joint portion of a cylinder head and a head cover and forms an inlet portion of an intake port that is integrally formed with the cylinder head.

Claims (4)

  1. A fuel injection type engine comprising:
    a cylinder head (233) having an intake port (2121) formed therein;
    a throttle body (2129) having an intake passage (2130) leading to the intake port (2121) in a body thereof;
    a throttle valve (2132) capable of controlling a flow area of the intake passage (2130) in the body such that the throttle valve (2132) is operable to be opened and closed;
    a fuel injection valve (2135) for injecting fuel toward the intake port (2121);
    wherein a connecting sleeve portion (2138) projects further outwardly relative to a joint portion of the cylinder head (233) and a head cover (234) and forms an inlet portion (2121a) of the intake port (2121) that is integrally formed with the cylinder head (233), a mounting hole (2136) which allows a distal end portion of the fuel injection valve (2135) mounted on the cylinder head (233) such that the fuel injection valve (2135) injects fuel towards the intake port (2121) to be hermetically fitted therein is formed in the connecting sleeve portion (2138), and the throttle body (2129) is connected to the connecting sleeve portion (2138) with an insulator (2128),
    characterized in that
    the throttle body (2129) is arranged on an upper side of a transmission (M) of the engine, an axis of the inlet portion (2121a) of the intake port (2121) which is integrally formed with the cylinder head (233) is arranged on a plane (PL2) which is substantially orthogonal to a cylinder axis (C), and an axis of the intake passage (2130) of the throttle body (2129) is arranged on the plane (PL2), wherein the insulator (2128) is formed such that the insulator (2128) is bent to keep being arranged on the plane (PL2).
  2. The fuel injection type engine according to claim 1, wherein an intake valve (2118) and an exhaust valve (2119) are operable to be opened and closed and are arranged in the cylinder head (233) such that operational axes thereof intersect in an approximately V-shape on a projection view to a plane (PL2) which includes the cylinder axis (C) and an axis of an inlet portion (2121a) of the intake port (2121), and a valve actuating device (2140) which has an axis substantially parallel to an axis of the inlet portion (2121 a) of the intake port (2121) and has a camshaft (2141) which is arranged between the intake valve (2118) and the exhaust valve (2119) is housed in a valve actuating chamber (2144) which is formed between the cylinder head (233) and the head cover (234) jointed to the cylinder head (233).
  3. The fuel injection type engine according to claim 1 or 2, wherein
    the engine (13) is mounted on a vehicle body frame (1), and
    a rear cushion (11) is interposed between a rear fork (10) and the vehicle body frame (1), and
    wherein the throttle body (2129) is arranged between the cylinder head (233) and the rear cushion (11) and the insulator (2128) is bent to avoid interfering with the rear cushion (11).
  4. The fuel injection type engine according to any one of claims 1 to 3, wherein a throttle drum (2133) which is arranged outwardly from the body (2129) and is integrally rotated with the throttle valve (2132) is arranged at a side opposite to the cylinder head (233).
EP04012332A 2003-06-23 2004-05-25 Layout structure of a fuel injection device in a motorcycle Active EP1491762B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2003177574A JP4270954B2 (en) 2003-06-23 2003-06-23 Motorcycle
JP2003177574 2003-06-23
JP2004061640 2004-03-05
JP2004061640A JP4620367B2 (en) 2004-03-05 2004-03-05 Arrangement structure of fuel injection device in motorcycle

Publications (3)

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EP1491762A2 EP1491762A2 (en) 2004-12-29
EP1491762A3 EP1491762A3 (en) 2005-03-16
EP1491762B1 true EP1491762B1 (en) 2010-11-10

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EP04012332A Active EP1491762B1 (en) 2003-06-23 2004-05-25 Layout structure of a fuel injection device in a motorcycle

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EP (1) EP1491762B1 (en)

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Also Published As

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US20040255909A1 (en) 2004-12-23
US7588009B2 (en) 2009-09-15
EP1491762A2 (en) 2004-12-29
EP1491762A3 (en) 2005-03-16

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